Vacuum tube for generating a wide beam of fast electrons

Claim 2

A vacuum tube for generating a wide beam for electrons, comprising a vacuumtight enclosure ; in said enclosure at least one elongated cathode for emitting an electron beam throughout its length, a control electrode for controlling the form and the homogeneity of said beam, said electrode comprising an elongated gap along which said cathode extends and through which said beam propagates ; said control electrode comprising a plurality of electrode elements electrically insulated from one another ; means for respectively connecting said elements to a voltage supply ; means for accelerating, said beam ; said vacuum-tight enclosure comprising an elongated electron-transparent window for the propagation of said beam outside said enclosure.

Claim 3

A vacuum tube as claimed in claim 1, wherein said electron-transparent window comprises thin first and second strips, supporting block for supporting said strips, said block being integrally connected with said vacuumtight enclosure ; said strips being separated from each other thus defining a space ; said cooling system comprising means for circulating an inert purified gas within said space.

Claim 4

A vacuum tube as claimed in claim 2, wherein said first strip is of titanium.

Claim 5

A vacuum tube as claimed in claim 2, wherein said first strip is of oxyde of beryllium.

Claim 6

A vacuum tube as claimed in claim 2, wherein said second strip is of aluminum.

Claim 7

A vacuum tube as claimed in claim 5, wherein said connecting means comprise means for applying respectively different voltages to said elements.

Claim 8

A vacuum tube for generating a wide beam for electrons, comprising a vacuumtight enclosure ; in said enclosure at least one elongated cathode for emitting an electron beam throught its length, a control electrode for controlling the form and the homogeneity of said beam, said electrode comprising an elongated gap along which said cathode extends and through which said beam propagates ; said control electrode comprising a plurality of electrode elements electrically insulated from one another ; means for respectively connecting said elements to a voltage supply ; means for accelerating said beam ; said vacuum-tight enclosure comprising an elongated electron transparent window for the propagation of said beam outside said enclosure ; said control electrode elements being substantially cylindrical similar and coaxial metal sleeves provided with a longitudinal opening, said openings forming said gap ; said sleeves being insulated from each other by means of insulating rings, coaxial with and having an opening substantially coextensive with said sleeve openings.

Claim 9

A vacuum tube for generating a wide beam for electrons, comprising a vacuumtight enclosure ; in said enclosure at least one elongated cathode for emitting an electron beam throught its length, a control electrode for controlling the form and the homogeneity of said beam, said electrode comprising an elongated gap along which said cathode extends and through which said beam propagates ; said control electrode comprising a plurality of electrode elements electrically insulated from one another ; means for respectively connecting said elements to a voltage supply ; means for accelerating said beam ; said vacuum-tight enclosure comprising an elongated electron transparent window for the propagation of said beam outside said enclosure ; said control electrode elements being substantially cylindrical similar and coaxial metal sleeves provided with a longitudinal opening, said openings forming said gap ; said sleeves being insulated from each other by means of insulating rings, coaxial with and having an opening substantially coextensive with said sleeve openings.